Mitsubishi 3000gt 1999 - Page 53

54-3
CHASSIS
ELECTRICAL
-
lgnition
switch and lmmobilizer
system
lnspection Procedure 2
Diagnosis code No.
54
has
been
generated
by the
engine-ECU.
Probable
cause
There
is a
problem
with communication between the enoine-ECU
and
the
immobilizer-ECU.
a
a
O
Malfunction of harness or
connector
Malfunclion
of
immobilizer-ECU
Malfunction of
engine-ECU
T
,e
Check the following connectors.
c-21
(LHD),
C-60
(RHD),
C-90, C-99
Check the
harness
wire between the
engine-ECU and
immobilizer-ECU,
and
repair if necessary
ls
diagnosis code
No. 21
being
gener-
ated bv the
immobilizer-ECU?
Checkthe harness between the immobi-
lizer-EOU
oower circuit and the earth
circuit.
(Refer
to
inspection
procedure
5.)
Replace the engine-ECU.
Disconnect the
engine-EOU connector
C-99 and immobilizer-EOu connector
C-90 and measure at the
harness
side.
o
Continuity between
the
C-99
terminal No. 91 and C-90 terminal
No.
5
OK: Continuity
Inspection Procedure
3
lD
code cannot be registered using the MUT-II. Probable cause
The
cause is
probably
that the immobilizer-EOU
cannot
read the lD
code, or there
is a malfunction of the immobilizer-EoU.
.
Malfunction of transponder
o
Malfunction of ignition key ring antenna
.
Malfunction of harness or connector
.
Malfunction of immobilizer-ECU
ls
a normal diagnosis
code
output?
To diagnosis code classification table
(Refer
to
P.54-1 .)
Checkthe
harness
between the immobi-
lizer-ECU
power
circuit
and
the
earth
circuit.
(Refer
to inspection
procedure
5.)
U